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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
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2. TTone crura (e consequenter anguli oppole) sunc similia vel distimilia,
1
elt = 90. Sed in ABD A, hypocenula B A est = 90.
PRTGONOMETRLA SPHERICA.
hypocenula est =1
ansuli sunc similes. Sin hyporenula (ic = 90, crura Tunc dissimilia, ee anguli
distimiles.
quitur d X e 2.
5. Vicistim C crus sic simide. 
dictim. 
dissimile
Ouo melius ob oculos producantur Sinus de Cotinus, alixeque Rectae ad ArCUS
spectances, quae alias lacene intra Sphaerae Soliditarem demertae: COmpinGANEUIE AF.
cus vel semicirculi ex charta crastiore fere ad modum Sphaerae Armillaris. Sinc puca
Arcus BP, B A, et incelligacur Planum Areus majoris B P H circa axem BH co
=90. Sic in criangulis, ED A, P C A, hypocenula AF
3. Vice verta. Si hypocenula (ic = 00; crura lune similia, e bini obliqui
9. 10.
ulque converti, dum perpendicularis d P demicta ad planum B a FY incidat in ali-
quod punctum D Racii C A. Nam in co ticu eric L’AB Fean Spherieum
Deinde incelligatur PC A (Schematis 1Y) = PC A (Schemacis 1O;) de in eo
collocetur ica _ seta CalM COHBLHANE. DUCANEUE AK,
BP, LR, de c0
prima, de exinde Eloperciones pro variis Priangulo.
mecrarum methodo agaenuS procedam: incer plana
BPC, BAC lupCriOrIS SOHOI, SCacaCI Cta FI
Sura 12 Chartacca, eo  loco quem licerae indicant.
Rectangulum ad A, _ BP AypocenuIa, B A BaliS, P A Areus perpendieuLaTIS.
PF TBC: CrUNE AF, PF, PD, SinUS ArcuUm B A,
NUS R C, FC, DC. IIIS PIX
Sicis vel concepcis, illico constabune Axiomaca duo
rum Rectangulorum calibus absque novo Schemace vel
lacerum Proc aa. SEd BIE reCePEa FrIBONO.
Tum in Priangutis Acclatisulis Sphaericis PBA, _B a
eundem angulum acucum ad balem habencibus.
Aa L  Primum.
Fig. 12.
dinus lypocenularum Luns dumbus Perpendicularium proportionales. Ll.
C2OM A
PD:: XC. 25.